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Re: [Paparazzi-devel] How to solve the radio control delay ?


From: hendrixgr .
Subject: Re: [Paparazzi-devel] How to solve the radio control delay ?
Date: Fri, 22 Aug 2014 14:14:09 +0300

Hi all
I had some serious health issues (quad bypass surgery) but now i am feeling better.
the delay noticed originates probably from the Esc's and the motor-propeller inertia-loading.
in fixed wing and in manual or auto1 mode the latency is always less than 60ms and it depends largely on the rc tx protocol used.
AFAIK the Fhss system from Frsky is the best i have tried (i think it is the same as the one from ACT Germany).
I might be wrong i just wanted to share my opinion.
Chris


On Fri, Aug 22, 2014 at 1:48 PM, Felix Ruess <address@hidden> wrote:
If you want to keep use the default arming_yaw, you can also set the delay: http://docs.paparazziuav.org/latest/autopilot__arming__yaw_8h.html


On Fri, Aug 22, 2014 at 9:46 AM, Christophe De Wagter <address@hidden> wrote:

I also recommend a kill switch instead of yaw stick arming.

On Aug 22, 2014 9:43 AM, "Prof. Dr.-Ing. Heinrich Warmers" <address@hidden> wrote:
Dear Eltonwu,

i made same bench test with the radio commands  and  the reaction  of the internal commands in RATE- and ATT_RC- mode.

The first screen shot showes the situation in RATE mode.
A great differential part is given when the stick moves. The commands can bee positive while the stick has a negative position.

The next screen shot showes the situation in ATT_RC  mode.
A differential part is given when the stick moves. The commands can bee positive while the stick has a negative position.

The next two screen shot showes the delay of 0.5s by the stick commands to switch the motor on and of.
This can generate dangers situations. Other projects use the left for motor on and the right posituation for motor off. commands without a delay.

Regads

Heinrich




Eltonwu schrieb:

   I use the ATT_RC mode to fly the rotorcraft. I found the radio control
has a little delay when control the craft's attitude.For example,when I push
the stick up,the craft changes it's attitude after about 200ms.When I
release the stick,the craft recover horizontality after about 200ms.
   Does anyone know how to solve this problem or encounter this problem? Is
it a PID tuning problem?

   Thanks in advance.



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